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Valve Guides Select Product Expansion Plug Kits Expansion Plugs in Bulk Lifters New Water Pumps Oil Pumps and Components Valves Valve Guides Valve Keepers Valve Seat Inserts Valve Springs Valve Spring Inserts Valve Stem Seals Materials: All 30- valve guides are individually cast in gray iron. Where required certain alloying materials such as chromium, molybdenum or nickel may be added. All guides meet or exceed OE material specifications. New! 31- Manganese Bronze Guides are now available! "H" Suffix Part numbers with an "H" suffix are additionaly hardened by heat treatment, to Rockwell 30 on the "C" scale.

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